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Author: Subject: Unconventional Shaped Charges
PHILOU Zrealone
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[*] posted on 18-2-2017 at 12:57


Where was the detonator placed...I have the feeling it was on the right side...right?



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[*] posted on 18-2-2017 at 18:21


Yes Philou, you are correct:)



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PHILOU Zrealone
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[*] posted on 18-2-2017 at 19:06


How did I figure this out, you will ask :)

I simply noticed that the lower left branch of the deto-printed "S" is much deeper than the uper right part...hence my conclusion...the cavity on the left acted as a shaped charge while the same cavity with an opposed orientation did not...so the detonation was obviously coming from the right side.
Also there is a strange diffuse patern at the right of the SM printing...:D;):P:cool:




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[*] posted on 18-2-2017 at 21:29


Yes, the detonator was probably right on top of that lower part of the S forming the shaped charge effect on the plate.
The unusual pattern on the right side is were I added an extra 5g portion with a smiley face which can be faintly seen but didn't turn out properly.. i forgot to mention it in the original post.




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[*] posted on 19-2-2017 at 02:17


Quote: Originally posted by greenlight  
Did a quick test with an older batch of PE and thought this might be the right place to post the pictures as the test demonstrates the Munroe effect.
I just took a 25 gram block and embossed SM (for sciencemadness:)) in it in mirrored letters before placing it down on a 1.5 inch thick steel plate.



Very cool execution of the Munroe effect, Greenlight :)


A bit of old experimentation from my side below....did not turn out too bad either :
DSCF0974.JPG - 1.4MB




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[*] posted on 19-2-2017 at 05:10


Thanks Markx, nice result as well. What explosive did you use for that experiment?




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PHILOU Zrealone
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[*] posted on 19-2-2017 at 05:51


Quote: Originally posted by markx  
Quote: Originally posted by greenlight  
Did a quick test with an older batch of PE and thought this might be the right place to post the pictures as the test demonstrates the Munroe effect.
I just took a 25 gram block and embossed SM (for sciencemadness:)) in it in mirrored letters before placing it down on a 1.5 inch thick steel plate.



Very cool execution of the Munroe effect, Greenlight :)


A bit of old experimentation from my side below....did not turn out too bad either :

Nice detono-graphy.

Just as beautifull as the leaves you let dry into a book :D.
Of course to do the same with your process would make heavy books for bodybuilders :D;):P:).




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[*] posted on 24-2-2017 at 13:54


Wow, that's just a stunning picture, yours turned out much better than my attempt at this! Even the colour matches, blotted that chlorophyl right into the steel, maybe it can still do photosynthesis :D. Leaf-shaped charges, very unconventional... I remember seeing sort of the same technique for shooting holograms in very hard metals, resolution was in the nanometer range IIRC. You could probably magnify using a microscope and discern some of the finer leaf structures as well probably. :)

[Edited on 24-2-2017 by nitro-genes]
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[*] posted on 26-2-2017 at 23:20


Quote: Originally posted by nitro-genes  
Wow, that's just a stunning picture, yours turned out much better than my attempt at this! Even the colour matches, blotted that chlorophyl right into the steel, maybe it can still do photosynthesis :D. Leaf-shaped charges, very unconventional... I remember seeing sort of the same technique for shooting holograms in very hard metals, resolution was in the nanometer range IIRC. You could probably magnify using a microscope and discern some of the finer leaf structures as well probably. :)

[Edited on 24-2-2017 by nitro-genes]


Thanks for the kind words, Nitro-genes! :)

Yea...this sample turned out most impressive and the fine detail was just stunningly precicely stamped into the metal. Although I tried to clean it up afterwards by leaching slightly in citric acid solution to get the soot washed off. That was not a good idea, as it made the image much flatter in appearance, still a very successful test though.




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[*] posted on 27-2-2017 at 03:32


Just noticed the patern...

OAK Leaf :-) into a troll's footprint :D

[Edited on 27-2-2017 by PHILOU Zrealone]




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[*] posted on 27-2-2017 at 06:31


Made a forming tool for more conventional applications :

WP_20170227_001.jpg - 1.3MB WP_20170227_002.jpg - 1.2MB WP_20170227_003.jpg - 1.2MB WP_20170227_004.jpg - 1.2MB

Works pretty good, but the copper has to be annealed several times inbetween of the pressing or the tip of liner will become too stretched and develop cracks.




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[*] posted on 27-2-2017 at 14:45


Quote: Originally posted by markx  
Yea...this sample turned out most impressive and the fine detail was just stunningly precicely stamped into the metal. Although I tried to clean it up afterwards by leaching slightly in citric acid solution to get the soot washed off. That was not a good idea, as it made the image much flatter in appearance, still a very successful test though.


Maybe finely polishing the plate before shooting some delicate structures into it may help getting even higher resolution. Noticing from the unblasted area of the plate, the surface is kind of rough, which would act like "background noise" for the image produced. Wondering if using a lotus leaf (water repelling nanostructures) would result in a metal surface having some interesting properties (May not be similar since a negative is produced). These kind of things may even have some unforeseen applications as well. :)

[Edited on 27-2-2017 by nitro-genes]
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[*] posted on 28-2-2017 at 00:20


Quote: Originally posted by nitro-genes  


Maybe finely polishing the plate before shooting some delicate structures into it may help getting even higher resolution. Noticing from the unblasted area of the plate, the surface is kind of rough, which would act like "background noise" for the image produced. Wondering if using a lotus leaf (water repelling nanostructures) would result in a metal surface having some interesting properties (May not be similar since a negative is produced). These kind of things may even have some unforeseen applications as well. :)

[Edited on 27-2-2017 by nitro-genes]


Of course using a flat polished surface will give immensly better resolution....the current test was executed in the spirit of "what the heck, let's see what happens" and had zero preparative actions done to enhance the contact surfaces.

That is a very captivating idea about the lotus leaf example :)! There are many interesting structures in nature that once copied onto manmade materials could reveal extraordinary properties. One could possibly also get a more or less positive image on the witness plate after reshooting the negative against a new witness surface. Technically this may prove to be quite complicated though, especially if the pattern is very fine and stretches into the field of nanostructures....




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[*] posted on 6-3-2017 at 10:25


Of course using a flat polished surface will give better resolution....Better is use a annealing metal, this is soft aluminium plate 0,5 mm.

feater.jpg - 1.5MB
.................:cool:...........Dr.




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[*] posted on 25-3-2017 at 02:51


Recently i was asking an airconditioning specialist for these little copper things they called helmets. they are found in brand new aircon units to prevent anything from getting into the system before installation. they come in various sizes and i was able to get quite a few of them. this gave me the means to try some micro sized shaped charges with an effective looking liner. The inspiration was from the little commercial blasting caps with the cavity in the end which i thought why not try that idea but slightly larger? these little liners would also fit into a smaller tube if needed so why not try it?
so i proceeded to get some 10mm Al tubing i had around and coated the inside with some paint before J.B welding 6 of these liners into 6X 10mm diameter 40mm long sections of tube.
For each of these little devices i used a filler of 2.1g 2-5 ETN/PETN melt cast and 250mg of lead picrate/azide clathrate. - this is why i lined the inside of the tubes prior to filling them. we are still unsure of the molten ETN reacting with Al. i have not actually heard of a case of ETN actually detonating in this manner but there has to be some substance to this claim though..... each charge was wired to fier electrically and 4 of them were given copper wire legs as standoff which i marked at the required distance to be bent with pliers on site.
So i used 3 each of the bell/cone shaped liners and 3 of the hemisperical liners. one of each was given no standoff one 15mm and the final 20mm. obviously the conical ones seemed to perform the best giving nearly 4mm penetration into the steel bar i had as the receiver hoever the 20mm hemispherical did leave a little divit on the back side of the steel where the others did not. i was only able to remove the copper carrots from the 1st hemi and the two conicals so i couldn't really compare the results as a whole but the conical ones did look pretty promising. i cannot be entirely sure of the effectiveness of the hemisperical but if there was enough force to completely embed the copper into mid carbon steel bar and nearlt split it completely lengthwise it has to be pretty effective. there was a fracture that ran nearly the whole length of the 20mm bar. i still have many of these little things left to try out and of larger sizes too.
Man were these little charges loud for their small sizes. it would have been about as loud as a shotgun going off.

001.JPG - 1.5MB 004.JPG - 1.9MB

[Edited on 25-3-2017 by NeonPulse]

015.JPG - 1.7MB




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[*] posted on 25-3-2017 at 02:59


and the results. the first lots are befor i attempted to remove the carrots and some after.

IMG_2233.JPG - 1MB IMG_2250.JPG - 875kB IMG_2251.JPG - 921kB

[Edited on 25-3-2017 by NeonPulse]

IMG_2237.JPG - 1.5MB




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